replaced dmz bg margins with background-position

footer margins

OO-1212. return the right mime types of documents for most of the documents types, force download html, xhtml and javascript files only

bootstrap-like button styles for calendar (normal and square styles)

borderless grey default button style

OO-1217: separate add/remove events from the rest of events which can close the administrator management popup

OO-1214: fix the switch show/hide for glossary, fix conflict between jQuery UI and Bootstrap tooltip, update glossary after every dom changes...

square style (no round borders)

OO-1209: import question (single choice, multiple choice, fill-in-blank) from an excel-like table to question pool or a QTI test

OO-1213: embed the next and previous in a special panel to assure that they are redraw after a change in visibility (from not visible to visible)

added config options for login bg gradient and navbar colors (chat icon and badge)